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High-Speed Sync Guide Number
Shutter
ISO
speed
ISO100
ISO200
ISO400
84
Camera format
35mm
85mm
DIGITAL
58mm
250
24.2
500
18.8
1000
14
2000
10.2
4000
7.3
6000
6.2
250
34.2
500
26.5
1000
19.8
2000
14.4
4000
10.4
6000
8.8
250
48.4
500
37.6
1000
28
2000
20.4
4000
14.6
6000
12.4
Zoom position
70mm
50mm
35mm
48mm
34mm
24mm
22.4
20.1
17.5
17.4
15.6
13.6
13
11.7
10.1
9.5
8.5
6.8
6.1
5.7
5.2
31.6
28.5
24.7
24.6
22.1
19.2
18.4
16.5
14.3
13.4
12.0
10.4
9.6
8.6
8.1
7.3
44.8
40.2
34.8
31.2
27.2
26
23.4
20.2
19
17
14.8
13.6
12.2
10.6
11.5
10.3
*With the wide-angle panel attached
28mm
24mm
19mm
16mm
15.7
14.3
12.2
11.1
9.1
8.3
7.4
6.6
6
5.3
4.8
4.3
4.5
4.0
3.7
22.2
20.3
17.2
15.7
12.8
11.7
9.4
8.6
7.5
6.7
6.1
6.3
5.7
5.2
35
31.4
28.6
24.4
22.2
18.2
16.6
13.2
12
9.6
8.6
8.9
8.0
7.3
*20mm
*13mm
9.4
7.3
5.5
4
2.9
2.4
13.3
10.3
7.7
5.6
4.0
3.4
18.8
14.6
11
8
5.8
4.8
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